GB1532093A - Magnetic transducer heads - Google Patents

Magnetic transducer heads

Info

Publication number
GB1532093A
GB1532093A GB14770/76A GB1477076A GB1532093A GB 1532093 A GB1532093 A GB 1532093A GB 14770/76 A GB14770/76 A GB 14770/76A GB 1477076 A GB1477076 A GB 1477076A GB 1532093 A GB1532093 A GB 1532093A
Authority
GB
United Kingdom
Prior art keywords
axis
degrees
strip
contacts
strips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB14770/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1532093A publication Critical patent/GB1532093A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures

Abstract

1532093 Magnetoresistive heads PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 12 April 1976 [15 April 1975] 14770/76 Heading G5R A magnetic head has an elongate magnetoresistive element 1 with an easy axis of magnetization M parallel to its length, a middle contact 21 midway between end contacts 5 and 6, a strip, or a pattern of parallel strips, 11 to 15, of readily electrically conductive material on the portion 2 of element 1 between contacts 5 and 21 with the or each strip at an acute angle of 30 degrees to 60 degrees to the axis M, and a similar strip, or pattern of parallel strips 16 to 20, of readily electrically conductive material on the portion 3 of element 1 between contacts 6 and 21 with the or each latter strip at an obtuse angle to the axis M, the obtuse angle being the supplement of said acute angle. Each strip 11 to 20 forms a respective equipotential surface so that with current sources 7 and 8 connected as shown and with strips 11 to 15 at 45 degrees to axis M and strips 16 to 20 at 135 degrees to axis M, the equipotential surfaces cause the current I 1 in element half 2 to be at 135 degrees to axis M and the current I 2 in element half 3 to be at 45 degrees to axis M. A differential amplifier 9 subtracts the voltage across contacts 21 and 6 from that across contacts 21, 5. The arrangement linearizes the resistance/magnetic field characteristic of the element 1 as a whole and reduces so-called temperature noise due to resistance charges caused by temperature fluctuations. The element 1 may be Ni-Fe alloy, 1,200 Š thick, 200 microns long and 10 microns wide, strips 11 to 20 being of gold each 1 micron thick and 5 microns wide.
GB14770/76A 1975-04-15 1976-04-12 Magnetic transducer heads Expired GB1532093A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7504438,A NL168981C (en) 1975-04-15 1975-04-15 MAGNETIC RESISTOR READING HEAD.

Publications (1)

Publication Number Publication Date
GB1532093A true GB1532093A (en) 1978-11-15

Family

ID=19823577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14770/76A Expired GB1532093A (en) 1975-04-15 1976-04-12 Magnetic transducer heads

Country Status (7)

Country Link
US (1) US4040113A (en)
JP (1) JPS51124411A (en)
CA (1) CA1062369A (en)
DE (1) DE2614165C2 (en)
FR (1) FR2308159A1 (en)
GB (1) GB1532093A (en)
NL (1) NL168981C (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2615539C2 (en) * 1975-04-14 1986-01-16 N.V. Philips' Gloeilampenfabrieken, Eindhoven Magnetic head with magnetoresistive element
NL7611522A (en) * 1976-10-19 1978-04-21 Philips Nv MAGNETO RESISTANCE READING HEAD WITH THERMAL NOISE REDUCTION.
FR2390778A1 (en) * 1977-05-13 1978-12-08 Cii Honeywell Bull MAGNETIC INFORMATION READING DEVICE
US4141051A (en) * 1977-10-11 1979-02-20 U.S. Philips Corporation Variable dynamic range magneto-resistive head
JPS5475284A (en) * 1977-11-29 1979-06-15 Asahi Chemical Ind Threeeterminal magnetic reluctance effect element
FR2413726A1 (en) * 1977-12-30 1979-07-27 Cii Hb METHOD AND DEVICE FOR READING CODED INFORMATION IN THE FORM OF INTERVALS OF PREDETERMINED QUANTITIES
DE3014469A1 (en) * 1980-04-15 1981-10-22 Siemens AG, 1000 Berlin und 8000 München MAGNETORESISTIVE SENSOR
US4371905A (en) * 1980-11-13 1983-02-01 Computer & Communications Technology Corporation High resolution hall effect read head
EP0081240B1 (en) * 1981-12-09 1989-06-28 Matsushita Electric Industrial Co., Ltd. Thin film magnetic head
DE3390321T1 (en) * 1982-11-11 1985-01-24 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Thin film magnetic head
US4535375A (en) * 1983-01-14 1985-08-13 Magnetic Peripherals, Inc. Magnetoresistive head
US4580175A (en) * 1983-01-14 1986-04-01 Magnetic Peripherals, Inc. Endless, folded magnetoresistive head
US4712144A (en) * 1985-08-20 1987-12-08 International Business Machines Corporation Method and apparatus for reading recorded data by a magnetoresistive head
US5048175A (en) * 1989-03-03 1991-09-17 Seagate Technology, Inc. Method for grounding pole structures in thin film magnetic heads
FR2656454B1 (en) * 1989-12-22 1995-07-21 Thomson Csf MULTIPISTE READING HEAD.
US5390061A (en) * 1990-06-08 1995-02-14 Hitachi, Ltd. Multilayer magnetoresistance effect-type magnetic head
US5065094A (en) * 1990-08-07 1991-11-12 Seagate Technology, Inc. Two terminal magnetoresistive sensor having DC blocking capacitor
US5555142A (en) * 1990-09-27 1996-09-10 Kabushiki Kaisha Toshiba Magnetic disk system
JP2707191B2 (en) * 1992-10-19 1998-01-28 シャープ株式会社 Multitrack magnetic signal reproducing device
US5327303A (en) * 1992-12-18 1994-07-05 Seagate Technology, Inc. MR preamplifier having feedback loops for minimizing differential low frequency components and regulating common mode low frequency components of the preamplifier output signal
US5455730A (en) * 1993-02-18 1995-10-03 International Business Machines Corporation Contact magnetic recording disk file with a magnetoresistive read sensor
US5426542A (en) * 1994-01-21 1995-06-20 Seagate Technology, Inc. Electronically coupled high-impedance magnetoresistive preamplifier
US5436773A (en) * 1994-06-10 1995-07-25 International Business Machines Corporation Enhanced linearity range for magneto resistive transducer servo by changing the direction of the bias current
US5764451A (en) * 1996-03-28 1998-06-09 Read-Rite Corporation Multi-tapped coil having tapped segments casaded for amplification for improving signal-to-noise ratio
US5914630A (en) * 1996-05-10 1999-06-22 Vtc Inc. MR head preamplifier with output signal amplitude which is independent of head resistance
US6456449B1 (en) 1997-08-07 2002-09-24 International Business Machines Corporation Disk drive with wide servo burst pattern and wide servo sensing element
GB0423676D0 (en) * 2004-10-25 2004-11-24 Arjo Wiggins Ltd Method for reading magnetic data

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814863A (en) * 1972-10-11 1974-06-04 Ibm Internally biased magnetoresistive magnetic transducer
NL164410C (en) * 1974-04-01 1980-12-15 Philips Nv MAGNETIC RESISTANCE MAGNETIC HEAD.

Also Published As

Publication number Publication date
FR2308159A1 (en) 1976-11-12
CA1062369A (en) 1979-09-11
DE2614165A1 (en) 1976-10-28
US4040113A (en) 1977-08-02
NL168981B (en) 1981-12-16
JPS51124411A (en) 1976-10-29
NL168981C (en) 1982-05-17
JPS5713049B2 (en) 1982-03-15
NL7504438A (en) 1976-10-19
DE2614165C2 (en) 1985-10-17
FR2308159B1 (en) 1982-04-23

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930412